<template>
  <div class="crud-opts">
    <span class="crud-opts-left">
      <!--左侧插槽-->
      <slot name="left" />
      <el-button
        v-if="crud.optShow.add"
        v-permission="permission.add"
        class="filter-item"
        size="mini"
        type="primary"
        icon="el-icon-plus"
        @click="crud.toAdd"
      >
        新增
      </el-button>
      <el-button
        v-if="crud.optShow.edit"
        v-permission="permission.edit"
        class="filter-item"
        size="mini"
        type="success"
        icon="el-icon-edit"
        :disabled="crud.selections.length !== 1"
        @click="crud.toEdit(crud.selections[0])"
      >
        修改
      </el-button>
      <el-button
        v-if="crud.optShow.del"
        slot="reference"
        v-permission="permission.del"
        class="filter-item"
        type="danger"
        icon="el-icon-delete"
        size="mini"
        :loading="crud.delAllLoading"
        :disabled="crud.selections.length === 0"
        @click="toDelete(crud.selections)"
      >
        删除
      </el-button>
      <el-button
        v-if="crud.optShow.download"
        :loading="crud.downloadLoading"
        :disabled="!crud.data.length"
        class="filter-item"
        size="mini"
        type="warning"
        icon="el-icon-download"
        @click="crud.doExport"
      >
        导出
      </el-button>
      <!--右侧-->
      <slot name="right" />
    </span>
    <el-button-group class="crud-opts-right">
      <el-button size="mini" plain type="info" icon="el-icon-search" @click="toggleSearch()" />
      <el-button size="mini" icon="el-icon-refresh" @click="crud.refresh()" />
      <el-popover placement="bottom-end" width="150" trigger="click">
        <el-button slot="reference" size="mini" icon="el-icon-s-grid">
          <i class="fa fa-caret-down" aria-hidden="true" />
        </el-button>
        <el-checkbox
          v-model="allColumnsSelected"
          :indeterminate="allColumnsSelectedIndeterminate"
          @change="handleCheckAllChange"
        >
          全选
        </el-checkbox>
        <el-checkbox
          v-for="item in crud.props.tableColumns"
          :key="item.label"
          v-model="item.visible"
          @change="handleCheckedTableColumnsChange(item)"
        >
          {{ item.label }}
        </el-checkbox>
      </el-popover>
    </el-button-group>
  </div>
</template>
<script>
  import CRUD, { crud } from '@crud/crud';
  export default {
    mixins: [crud()],
    props: {
      permission: {
        type: Object,
        default: () => {
          return {};
        },
      },
    },
    data() {
      return {
        allColumnsSelected: true,
        allColumnsSelectedIndeterminate: false,
      };
    },
    created() {
      this.crud.updateProp('searchToggle', true);
    },
    methods: {
      toDelete(datas) {
        this.$confirm(`确认删除选中的${datas.length}条数据?`, '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning',
        })
          .then(() => {
            this.crud.delAllLoading = true;
            this.crud.doDelete(datas);
          })
          .catch(() => {});
      },
      handleCheckAllChange(val) {
        if (val === false) {
          this.allColumnsSelected = true;
          return;
        }
        this.crud.props.tableColumns.forEach((column) => {
          if (!column.visible) {
            column.visible = true;
            this.updateColumnVisible(column);
          }
        });
        this.allColumnsSelected = val;
        this.allColumnsSelectedIndeterminate = false;
      },
      handleCheckedTableColumnsChange(item) {
        let totalCount = 0;
        let selectedCount = 0;
        this.crud.props.tableColumns.forEach((column) => {
          totalCount += 1;
          selectedCount += column.visible ? 1 : 0;
        });
        if (selectedCount === 0) {
          this.crud.notify('请至少选择一列', CRUD.NOTIFICATION_TYPE.WARNING);
          this.$nextTick(function () {
            item.visible = true;
          });
          return;
        }
        this.allColumnsSelected = selectedCount === totalCount;
        this.allColumnsSelectedIndeterminate = selectedCount !== totalCount && selectedCount !== 0;
        this.updateColumnVisible(item);
      },
      updateColumnVisible(item) {
        const table = this.crud.props.table;
        const vm = table.$children.find((e) => e.prop === item.property);
        const columnConfig = vm.columnConfig;
        if (item.visible) {
          let columnIndex = -1;
          // 找出合适的插入点
          table.store.states.columns.find((e) => {
            columnIndex += 1;
            return e.__index !== undefined && e.__index > columnConfig.__index;
          });
          vm.owner.store.commit('insertColumn', columnConfig, columnIndex, null);
        } else {
          vm.owner.store.commit('removeColumn', columnConfig, null);
        }
      },
      toggleSearch() {
        this.crud.props.searchToggle = !this.crud.props.searchToggle;
      },
    },
  };
</script>

<style>
  .crud-opts {
    padding: 4px 0;
    display: -webkit-flex;
    display: flex;
    align-items: center;
  }
  .crud-opts .crud-opts-right {
    margin-left: auto;
  }
</style>
